Hi, I had specified new "underlayment" to be put over the old 3/4" pine board subfloor in a new 2nd story addition. What our contractors installed in our absence is regular 1/2" OSB sheathing material, not specifically rated as underlayment. They screwed and glued it down very well. After two weeks I already see swollen areas and chips coming loose due to water being dragged in and left due to the construction. Is OSB sheathing considered a reasonable underlayment for a carpet? I expected plywood rated underlayment, with the top side sanded, not this chunky stuff which is not even particularly smooth to begin with. Regards, Wolfgang in VT
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18 years ago